Two Clear Brook High School students were arrested Thursday morning, less than an hour after school started.

The two teens were removed from the campus and taken to jail.

Both students are boys. One is a freshman, and the other a sophomore at the high school. Police say they don't appear to know each other, and the separate social media posts are not believed to have been coordinated.

Images and messages, which appear to be threatening the school were posted on their Snapchat accounts, according to police.

School administrators were alerted to the messages by other students.

According to the Harris County District Attorney's Office, the 9th grader warned other students not to come to class because he was going to "shoot up the school" in video, in which he is shown holding a gun and pointing it at the camera.

The image posted by the 10th grader was a photo, which appears to show the grip of a gun and two students in the background at the school.

A caption read that he was doing it to honor "The heroes of Columbine."